Intro To Statistics Module 5 (A+ Graded 100% Verified)

Use the TI 83/84+ calculator to find the mean, variance and standard deviation. {Ans: 1. Enter the values of the random variable x in L1 and the probabilities of x in L2. 2. The mean and standard deviation can be found choosing STAT / CALC / 1-Var Stats / L1,L2 / ENTER 3. x will be the mean and σx will be the standard deviation. Square the standard deviation to obtain the variance.}Random Variable {Ans: a variable (typically represented by x) that has a single numerical value, determined by chance, for each outcome of a procedure.}Expected value of a discrete random variable {Ans: Dentoed by E, and it represents the average value of the outcomes it is obtained by finding the value of: Σ x × P(x)}Expected value of a Discrete Random Variable X is {Ans: denoted by E, and it is the mean value of the outcome, so E = μ and E can also be found by evaluating Σ[x⋅P(x)],}Range Rule of Thumb {Ans: most of the "usual" values occur within two standard deviations of the mean.}Discrete Random Variable {Ans: collection of values that is finite or countable. (If there are infinitely many